[Issue 7953] New: DMD Error: variable r used before set when compiling with -O

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7953

           Summary: DMD Error: variable r used before set when compiling
                    with -O
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: suicidenet at xited.de


--- Comment #0 from Zoadian <suicidenet at xited.de> 2012-04-20 12:30:21 PDT ---
When compiling this code with dmd -O it says:
test.d(55) Error: variable r used before set
i might have overlooked something, but shouldn't that compile?
dmd 2.059 here.


import std.stdio;
import std.math;
import core.simd;
import std.datetime;
import std.conv;

/**
Benchmarks:


suicide at zoaHTPC /media/code $ dmd test.d
_VEC: [TickDuration(2014413920)]
SIMD: [TickDuration(2057610817)]
suicide at zoaHTPC /media/code $ dmd test.d -O
_VEC: [TickDuration(1589025986)]
SIMD: [TickDuration(2050198165)]
suicide at zoaHTPC /media/code $ dmd test.d -O -release
_VEC: [TickDuration(1738538836)]
SIMD: [TickDuration(1172608340)]
suicide at zoaHTPC /media/code $ dmd test.d -O -release -inline
_VEC: [TickDuration(1570424587)]
SIMD: [TickDuration(1184942170)]
suicide at zoaHTPC /media/code $ dmd test.d -O -release -noboundscheck
_VEC: [TickDuration(752330929)]
SIMD: [TickDuration(1128528117)]

*/


 string gen(int D) {
        string s;
        for(size_t i = 0; i < D-1; i+=4)
        {
            s ~= "v1.array = a1["~to!string(i)~".."~to!string(i+4)~"];";
            s ~= "v2.array = a2["~to!string(i)~".."~to!string(i+4)~"];";
            s ~= "r = __simd(XMM.ADDPS, v1,v2);";            


            //~ s ~= "res["~to!string(i)~".."~to!string(i+4)~"] = r.array;";
            s ~= "res.ptr["~to!string(i)~"] = r.ptr["~to!string(i)~"];";
            s ~= "res.ptr["~to!string(i+1)~"] = r.ptr["~to!string(i+1)~"];";
            s ~= "res.ptr["~to!string(i+2)~"] = r.ptr["~to!string(i+2)~"];";
            s ~= "res.ptr["~to!string(i+3)~"] = r.ptr["~to!string(i+3)~"];";
        }
        return s;
    }

T[D] simdAdd(T, int D)(T[D] a1, T[D] a2) {
    T[D] res;
    float4 v1;
    float4 v2;
    float4 r;

   //writeln(gen(D));
    mixin(gen(D));
    return res;
}

T[D] addV(T, int D)(T[D] a1, T[D] a2) {
    T[D] r;
    //foreach(x;0..10)
        foreach(i;0..D)
            r[i] = a1[i]+a2[i];
    return r;
}


void main()
{
    float[8] v1 = [1,2,3,4,1,2,3,4];
    float[8] v2 = [1,2,3,4,1,2,3,4];
    void test1(){addV(v1,v2);}
    void test2(){simdAdd(v1,v2);}

   // test2();
    //~ writeln("STD: ",
benchmark!(addS!(int,4)([1,2,3,4],[1,2,3,4]))(10_000_000));
    writeln("_VEC: ", benchmark!(test1)(10_000_000));
    writeln("SIMD: ", benchmark!(test2)(10_000_000));
}

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